[JENKINS-70246] Unexpectedly wide sidepanel

[timja]

See JENKINS-70246.

Testing done

Checked on a variety of device sizes using chrome device emulator, ipad mini, ipad pro, surface pro, etc

Proposed changelog entries

• Adjust side panel sizes for certain screens like iPad Pro.

Proposed upgrade guidelines

N/A

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Desired reviewers

@mention

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[NotMyFault]

Thanks!

[timja]

/label ready-for-merge

---

This PR is now ready for merge, after ~24 hours, we will merge it if there's no negative feedback.

Thanks!